[issue21503] Use test_both() consistently throughout test_importlib

[Eric Snow]

Eric Snow added the comment:

> I don't love the formatting of the test_both() lines, but I think that one is just an aesthetic thing that will never make people happy -- weird line wrapping or really long lines -- so just leave it as-is in your patch.

Yeah, I went with the formatting that I did because I found it a
little easier to follow (stronger separation between elements) and
visually distinguish in the code.  It was also a little easier to
grep/search for.

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